haven't heard problems with TD27-T in terms of parts availability and maintenance. parts are pretty much the same with the non-turbo type except for the pistons and rings which are easy to get too. pero common naman sa mga turbo charged engines ang nagkakaproblema sa turbo charger, lalo na sa mga surplus engines. probably na worn out na nung dating may ari. pero d2 sa philippines common naman ang 2nd hand parts or chop-chop so you won't be having problems finding a replacement turbo charger assy.